How can I limit my cart to one product at a time?

Store Design
1

Hello, i use Dawn theme

I want to keep only one product in cart. Example when customer add sencond product to cart previous product must delete. I want to keep only one product in cart. How do i this ?

Thanks

2

Hello @Can100

This will need tweaks and change in dawn theme script. Do take help of a developer.If needed you can contact me.